Valve grinder



Jana 22 1,481,568 E. G. SMIT-H VALVE MINDER Filed April 25, 1921 HUUR/rek! Patented dan. 22, 1924.

narran srarss nenne. SMITH, or PORTLAND, .cano-N, essie-Nonor ONE-HALF 'ro maar s. r

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:Appia-ation inea apra 2a, 1921. serial No. aeaeez.

To all whom t 'may concern:

Be it hereby known that l, EARL G. SMITH, citizen of the United States, and resident of Portland, in the county of Multnomah' and State of Oregon, have iny'vented a new and useful Valve Grinder, of

which the following is a specification.

rThis'invention relates more particularly to a device for grinding in the poppet 1") valves of an internal combustion engine. VThe objectof my invention is to provide an exceedingly simple and efficient mechanisin for grinding valves by applying a rotary movement back and forth, rand at V one of the reversals of rotation of said valve to .permit same to rise off of its seat before again applying rotary motion, foi the purpose of producing what is known as a satin finish on the valve and seatin prefs'l `erenceto the bright finish produced when the valve is rotated in one or both directions without permitting same to be lifted manually, and to eliminate thereby the tendency of the abrasivek to score the parts v instead of producing a perfectly smooth and uniform surface.

I attainV these results in the manner set forth in the following specification and illustrated in the accompanying drawing, in which:

` Figure 1 is a vertical section through the device. Figure 2 is an end elevation. Figure 3 is a horizontal section along the line 3 3 in Fig. 1. Figure l is a detailed View of the valve. Figure 5 is a section along the line 5 5 in Fig. 4. Figure 6 is a section along the line 6 6 in Fig. 4. Figure 7 is a partial plan of the valve casing showing a modification of the manner of forming a 4x0 narrow port or passageway partially around the perimeter of the valve. Figure 8 is a sectional View along the line 8 8 in Fig. 7.

Similar numbers of reference refer to the f5 same or similar parts throughout the several i the piston 14'. A screw 17 provided with a j amb nut 18 holds the spline 15 in place.'

The vpiston 111 `is provided witha centralY opening 19 throughout' almost its entire length, the upper end of the piston 14 be-f ing closed and the lower end being counter-` bored t'o receive a perforated disk 20, which is pinned to the piston 111 to preventrotation and' heldin placeby means of the circular nut 21.v Slidably supported inthe somewhat square perforation in the f disk 2O is a spiral-ended shaft 22 capable of rotation but not of sliding movement. y

the sleeve 25 but permits the'insertion of a` shank 2T to which it may be secured by a pin 28. 1 n Y 4. p @n ytheange 29 of the sleeve v25 I have mountedv the two `wrist pins 30 on each of which is pivoted a plunger 31, and yaround which is placed a spiral 32.V

ln the frame 10 and parallel to the axis of the cylinder 11 I have placed a rotary valve 33 having a shouldered head 34 which may be knurled to assist in the manual operation ofthe valve, if desired. A hole 35 is formed in the valve 33; from its upper end and extending almost its entire length. Connecting the bottom of this hole with the exterior of the valve is a port 36 which is arranged to register with the port 37 in the wall of the valve chamber and communicating with the lower end of the cylinder 11 when the valve 32 is in one-of its extreme positions. A sec'- ond port 38 connects the upper end of the hole 35 with the upper end of the cylinder 11 when it registers with the communicating port39 at the opposite extreme position of travel of the valve 33. rEhe opening 110 compression spring vpasses entirely through the valve 33l and a balancing groove 41 is turned around the valve at the hole 410. Suitably controlled air pressure is admitted through an air hose to the nipple 42 kwhich is threaded into lthe valve casing 43. A self-closing oiling plug It ref ceives a backward and forward rotation movement of lthe (lli 44 is threaded into the upper end of the hole in the' valve 33.

The lower end 46 of the valve 33 is shouldered and has secured thereon by means of the pin 47 a disk 48 which is recessed on one side to form the two stop faces 49 which are adapted to engage the screw 50 and limit the travel of the valve in either direction.y v y A square-faced notch 51 is also formed in the periphery of the disk 48. A pair of pawls 52 are mounted on the stud 53 on which they are secured by means of the cotter 54. A double-endedl spring 55 is also mounted on the stud 53 between the pawls 52 and holds same against the periphery of the disk 48. The notch 51 and the spacing of the pawl tips are proportioned to permit one or the other of the pawls to engage one of the squareA faces of the notch 51 in either of the extreme positions of the valve 33, thereby locking same in place against the stop 50. Also on the disk 48 are the two pivotal guides 56 which receive the ends of the piungers 31. Extension sleeves 57 are secured to Ithe guides 56 to prevent the plungers 31 from escaping from their guides in certain positions which will develop through the operation of the machine.

It will be seen in Figure 3 that the tip 58 of either of the plungers 31 may engage its respective pawl whenever the member 29 approaches its eXtreme position in either di* rection. As an illustration in this figure it will be seen that in assuming this position the plunger' 31 first compresses the spring 32 until the point 58 of Ithe plunger 31 presses against the pawl 52 and disengages it from the notch 51. It will be borne in mind that the locked position of the valve represents rthe time during which the inlet and outlet valves are wide open. The instant that the pawl 52 is released the valve 33 is quickly Vrotated to its opposite position and a corresponding condition prevails.

Near the ports 36 and 38 I have provided Ithe longitudinal grooves 59 which are adapted to connect with the exhaust ports 60 formed in the side of the valve chamber 43. The exhaust ports 60 are placed a safe distance away from the ports 36 and 38. Circular grooves 59A connect with the grooves 59 in order to complete the passageway to the exhaust ports 60.

In order to protect the working parts of the valve operating gear I have provided an easily removable cover G1 which is held in place by means of the screw 50.

Inasmuch as the various valves are chieiiy equipped with slots and holes for turning same I have supplied a special tip 62 having standard shapes formed on its various sides which may be brought into use by extract-- ing the pin 63 and turning the desired shape downward and then reinserting the pin G3.

In Figures 7 and 8 I have illustrated a simple method for accomplishing the same results produced by the grooves 59A. A hole 59B is drilled through the valve easing 43 at the same height as the groove 59A so that it Will break into the valve chamber as illustrated. This hole, of course, would then be plugged in the most convenient manner, preferably by the use of a screw 59C.

The operation of my device is as follows: After placing a suitableabrasive between the valve and its seat and engaging the meniber 62 with the valve, air is admitted to the interior of the valve 33, If for any reason the valve has stopped on center it must be brought to either of its extreme positions manually by means of the knurled head on the cap Air is then admitted to the cylinder 11 and the piston 14 is forced to its opposite end, which in turn, causes a vertical rotation ofthe shank 27 and therefore oi: the valve being reseated. The reversal of the valve 33 beingI accomplished as previously described causes the piston 14 to return to the opposite end of the cylinder,

which reversal of motion causes a slight jump to the mechanisml which is followed by the valve being raised due to the action of the valve spring itself. I

It is this jumping action which permits the admission of more abrasive and the shifting of its position with relation to the valve seat. and also produces what might be termed to be a riveting action on the niet-al of the valve and its seat, rather than polishingor smoothing action previously referred to. It is this jumping action which produces the satin linish so desirable for the perfect seating of a valve. j

While I have thus illustrated and described my invention it .is not my purpose to limit myself to this precise form or method of applicatiombut intend that it shall cover all forms and modifications that fall fairly within the appended claims.

Vhat I claim as new is:

, 1. A valve grinder having in combination a. body member including a cylinder formed therein, a slidable piston within said cylinder including means for holding same against rotation, a rocking sha-ft projecting into said piston and outside of said cylinder, said shaft having a square end formed into a spiral which fits into a square hole'in said piston. a` flanged tool-holding sleeve secured on the rounded end of said shaft, a rotary valve within said body member having ports for admitting air from its interior to the opposite ends of said cylinder alternately, a notched disk secured to said valve, a pair of pawls adapted to engage the notch in said disc at opposite ends of the valve travel, a pair of plungers pivoted onysaid ianged sleeve. guides on said disc adapted to direct said plungers against said pawls and springs on said plungers adapted to rollO tate said valve after it is released by said plungers.

2. In a controlling mechanism for rotary valves, the combination of a rotatable valve,

a fixed stop for limiting the rotation of saidV valve, a pair of opposed paWls engaging the periphery of said valve, means for releas ing alternate paWls at each valve movement, and spring means for actuating said valve.

3. In a controlling mechanism for rotary valves, the combination of a rocking crank member having tvvo opposed spring-carrying plungers pivoted to its face, a rotary valve mounted parallel to the axis of said crank, a disk mounted on the end of said valve having a recess in its periphery, a stationary stop Ymeans mounted between the ends of said recess, said disk having a notch also formed in its periphery, a pair of op posed pawls mounted on a common pivot and adapted to engage said notch at either end of its travel, a pair of opposed guide members pivoted on said disk in a manner to slidably receive the ends of said springcarrying plungers and force same against said pawls whenever their respective springs are sufliciently compressed.

'4. The combination of a rocking crankV member having mounted theron a pair of Wrist-pins with a pair of plungers pivoted on said pins, a notched valve actuating disk, a pair of pawls adapted to engage the notch in said disk, a pair of guidesy for said plungers pivoted on said disk, said guides directing said plungers toward said parvis, and springs on said plungers adapted to be compressed by said crank until said plungers dsengage said paWls alternatelyV which i 'adapted to impart a rocking motion to said shaft as said piston is reciprocated, a flanged projects from' said plug, a pair of Wristpins mounted onV said flanged sleeve, a pair of plungers pivoted on said wrist pins, a notched disk secured on said valve, a pair of plunger guides rotatably carried by said disk, springs on said plungers between said Wrist pins and guides and a pair of opposed paWls adapted to engage the notch in said disk and to be disengaged by the first portion of the travel of said n lungers.

EAR G. SMITH.

Vsleeve secured to the end of said shaft which 

